The Cabin at the End of the World by Paul Tremblay

Andrew and Eric are raising their adopted daughter, Wen to be gentle and love nature so it takes them by surprise when they are at their cabin and a group of strangers comes to them with a horrible dilemma. The leader of the group tries to keep them calm but the situation is anything but as he explains that they must willingly sacrifice one of them in order for the apocalyptic events to stop. There is a cult feeling to this book and you don't want to believe that what they preach will actually come to pass. The story progresses from Andrew, Eric and Wen's point of view. The attacks and the violence that happens in the cabin matches the violence that is going on in the outside world. Super scary, edge of your seat thriller.